package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /*
    * 营业额统计
    * */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //dateList集合用于存放begin到end之间的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            //计算日期并添加到dateList中
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //turnoverList用于存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();

        for (LocalDate date : dateList) {
            //计算查询条件beginTime endTime
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询orders表获取数据
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /*
     * 用户统计
     * */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //dateList集合用于存放begin到end之间的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            //计算日期并添加到dateList中
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //newUserList存放每天的新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //totalUserList存放每天的用户总数
        List<Integer> totalUserList = new ArrayList<>();


        for (LocalDate date : dateList) {
            //计算查询条件beginTime endTime
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();

            //查询总用户数量
            map.put("end",endTime);
            Integer totalUser = userMapper.countByMap(map);

            //查询新增用户数量
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /*
    * 销量排名top10
    * */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        //计算查询条件beginTime endTime
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        //查询数据 name，number
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        //将查询到的数据封装成字符串形式
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return new SalesTop10ReportVO(nameList,numberList);
    }

    /*
    * 订单统计
    * */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //dateList集合用于存放begin到end之间的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while (!begin.equals(end)){
            //计算日期并添加到dateList中
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            //查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .validOrderCount(validOrderCount)
                .build();
    }

    /*
    * 根据条件查询订单数量
    * */
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end ,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /*
    * 导出运营数据报表
    * */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库获取营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDatas = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN),
                LocalDateTime.of(dateEnd, LocalTime.MAX));

        //通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader()
                .getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格Sheet标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据 时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "--" + dateEnd);

            //获取第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDatas.getTurnover());
            row.getCell(4).setCellValue(businessDatas.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDatas.getNewUsers());

            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDatas.getValidOrderCount());
            row.getCell(4).setCellValue(businessDatas.getUnitPrice());

            LocalDate date = dateBegin;
            //填充明细数据
            for (int i = 0; i < 30; i++) {
                date = date.plusDays(1);

                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN),
                        LocalDateTime.of(date, LocalTime.MAX));

                //获取某一行并填充数据
                XSSFRow sheetRow = sheet.getRow(7 + i);
                sheetRow.getCell(1).setCellValue(date.toString());
                sheetRow.getCell(2).setCellValue(businessData.getTurnover());
                sheetRow.getCell(3).setCellValue(businessData.getValidOrderCount());
                sheetRow.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                sheetRow.getCell(5).setCellValue(businessData.getUnitPrice());
                sheetRow.getCell(6).setCellValue(businessData.getNewUsers());

            }

            //通过输出流对象将Excel下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
